That is confusing cause and effect. Because companies move their manufacturing operations to china it becomes harder to manufacture in the US. They did not initially move to China because of a lack of dometic skilled workers, but because of lower costs. The result of that move was, after a delay, the de-skilling of the US labor force, creating the lack of domestic skilled workers we have now. To recover from that would require a reverse migration of manufacturing activity which would, after a delay, create more skilled workers in the US.
Skills follow activity, they do not lead activity. You learn by doing.
If you want to develop good bridge building skills, then build a lot of bridges. As a result of that process, you will, after a delay, have a labor pool that knows how to do it well, and the bridges you build later on will be higher quality than the bridges you started out building.
You do not wait for the labor pool to sprout up like mushrooms spontaneously from the ground, so there are all these bridge builders standing around with nothing to do, and then you decide that you'll have them fill up a few rooms and and hire some of them to build a bridge.